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-4 + c = -9 -4 + 4 + c = -9 +4 c = -9 + 4 c = -5
-5
C = 5/9 (f - 32)c = 5/9 (-36)c = -20
First rearrange the equation into the form y = mx + c 4x - 3y = 9 3y = 4x - 9 y = (4/3)x - (9/3) Remember for y = mx + c that ' m ' the slope/gradient , and ' c ' is the y-intercept. Hence the slo[pe is (4/3) y- intercept is 9/3 = 3
Exactly -4 °F is equal to -20 °C The conversion formula is °C = 5/9 (°F - 32)