FORMULA

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What is the value of x if y = 23 in the formula y = 4x+3?
What is the value of b if a = -2 in the formula b = 2a-11?
What is the value of x if y = -5 in the formula 2x+3y = 23?
What is the value of v if u = 10, a = 3 and t = 2 in the formula u = v + at?
Calculate the value of y when
Calculate the value of y when
Make a the subject of the formula

Make z the subject of the formula x+3= 2y+z
Make y the subject of the formula 2x-10= 2y+4z
Make a the subject of the formula 5a - 10b + 4c = 0
Make z the subject of the formula
y is directly proportional to x+5. When x is 4, y is 18. Express y in terms of x.
a is directly proportional to When a is 1, b is 3. Express a in terms of b.
x is inversely proportional to y-10. When x is 2, y is 12. Express x in terms of y.
a is inversely proportional to b+2. When a is 1, b is 5. Express a in terms of b.