Given the ratio of x : y is 7 : 4 and x + y = 88. Work out the value of x – y
7x = 4yx=4y/7If we insert this into our other equation.4y/7 + y = 8811y/7 =88y = 56As we knowx =4y/7X= 4*56/7 = 32Then we can work out the answer X - Y = 32 - 56 = -24
SK
Related Maths GCSE answers
All answers ▸The point P has coordinates (4, 5). The point Q has coordinates (a, b). A line perpendicular to PQ is given by the equation 5x+3y=11. Find an expression for b in terms of a.
How can I work out the equation of a line defined by 2 known points?
Solve the simultaneous equations: 2x + y = 12; x - y = 6
x^2-9x+20=0